♂, Surat Thani, Thailand. (RIEB)		♀, Surat Thani, Thailand. (RIEB)
♂, Surat Thani, Thailand. (RIEB)	♂, Surat Thani, Thailand. (RIEB)	♀, Surat Thani, Thailand. (RIEB)

ON : Meandrusa gyas nagamasai Okano, 1986 OD : Tokurana. 11(2):1-5, figs.1(HT,♂), 2(HT,♂Un), 5(PT,♂). TL : Ranong, S.Thailand. (♂, in coll. K.Okano) Distribution : P.Thailand (Ranong ; Surat Thani). ● ssp.aribbas ● ssp.sukkiti ● ssp.helenusoides ● ssp.nagamasai

Holotype ♂, Apr.1983. "Ranony" [Ranong], S.Thailand. (in coll. K.Okano, examined)
Paratypes : 1♂, Mar.1983. Khao Poata, S.Thailand. (in coll. K.Okano, examined) ; 1♂, Thailand. (in coll. K.Okano, examined) ;
1♂, Feb.-Apr.1984. "Ranony" [Ranong], S.Thailand. (NHML, examined)

[ THAILAND ]
Papilio gyas aribbas ; Godfrey,1932a : 264. (Surat Thani: Khao Poata)
Meandrusa sciron nagamasai ; Pinratana & Eliot,1992 : 30,44, pl.54, figs.42b♂,♀. (Ranong)
Meandrusa lachinus nagamasai ; Ek-Amnuay,[2007] : 106, pl.25, figs.P50b♂,♂(Un),♀,♀(Un). (Ranong)
Meandrusa lachinus nagamasai ; Kimura et al.,2011 : 130, figs.♂,♂(Un),♀,♀(Un). (Kao Poh Ta)
Meandrusa lachinus nagamasai ; Ek-Amnuay,2012 : 106, pl.25, figs.P47b♂,♂(Un),♀,♀(Un). (Ranong; Surat Thani)

[ THAILAND ]
Surat Thani : 19♂ 11♀ (RIEB).

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The butterfly is locally very common in montane forests at moderate elevations (Alt. 1200 - 1300m) and is frequently found on top of mountains. Males are territorial on trees at hilltops and fly in circles for long hours in their territorial space.
The populations from W.Thailand and Dawna range, S.Myanmar have similar shape of tail to those of ssp.nagamasai. Further taxonomic study is needed.

Okano, K.,1986 : A New Subspecies of Meandrusa gyas (Papilionidae) from Thailand.
Tokurana 11(2):1-5, 6 figs.

♂, Surat Thani, Thailand.

1996.10.07 - 2022.05.31.